EP0195115B1 - Dichtring - Google Patents

Dichtring Download PDF

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Publication number
EP0195115B1
EP0195115B1 EP85109911A EP85109911A EP0195115B1 EP 0195115 B1 EP0195115 B1 EP 0195115B1 EP 85109911 A EP85109911 A EP 85109911A EP 85109911 A EP85109911 A EP 85109911A EP 0195115 B1 EP0195115 B1 EP 0195115B1
Authority
EP
European Patent Office
Prior art keywords
sealing
sealing lip
inclination
machine part
sealing ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85109911A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0195115A2 (de
EP0195115A3 (en
Inventor
Richard Bender
Erich Habel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Priority to AT85109911T priority Critical patent/ATE56797T1/de
Publication of EP0195115A2 publication Critical patent/EP0195115A2/de
Publication of EP0195115A3 publication Critical patent/EP0195115A3/de
Application granted granted Critical
Publication of EP0195115B1 publication Critical patent/EP0195115B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/56—Other sealings for reciprocating rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip

Definitions

  • the invention relates to a sealing ring for one. and machine part comprising a sealing element made of polymer material, which is provided with at least one sealing lip which is pressed elastically against the relatively moving machine part.
  • Such a sealing ring is known from GB-A-20 85 983. It is intended for sealing a reciprocating rod and is provided with a sealing lip which concentrically surrounds the rod and which engages with the rod in all circumferential areas in a corresponding plane which extends perpendicular to the direction of movement.
  • the invention has for its object to show a sealing ring for a reciprocating machine part, which ensures the achievement of an excellent sealing result and which is largely insensitive to foreign matter contained in the sealed medium.
  • sealing lip has a profile which is adapted to the cross section of the relatively moving machine part and is inclined to a plane extending transversely to the direction of movement in such a way that there are successive regions in the circumferential direction which form a cause lateral displacement of the stripped medium in tangentially opposite directions, and that the areas seamlessly form an axially impermeable sealing tape.
  • the sealing lip of the sealing ring according to the invention is essentially obliquely assigned to the direction of movement of the relatively moving machine part in all areas, which necessitates a lateral displacement of the stripped medium while the stripping process is being carried out. This results in an intensification of the mixing of the stripped volume in itself. It results from the mutual superimposition of the circulation of the stripped volume in the direction of movement with a corresponding circulation in the circumferential direction. Excellent lubrication of the dynamic sealing zone is thereby always guaranteed, the formation of caking in this critical area is effectively prevented.
  • the sealing lip can have a constant inclination within each area, which, in addition to a straight course, requires an abrupt change in direction at each transition point to the adjacent area.
  • the sealing lip has a changing inclination within each area and if it connects adjacent areas without a sudden change in inclination.
  • the resulting sealing tape has a sinusoidal curve.
  • the sealing ring according to the invention is preferably used in the sealing of piston rods.
  • the pressing direction of the sealing lip is directed inwards.
  • Versions in which the sealing lip has an outward pressing direction are suitable for sealing pistons.
  • the shape of the sealing lip is thus in any case adapted to the shape of the machine part to be sealed, and in individual cases there may also be deviations from the usual, rotationally symmetrical shape.
  • An oval profile, a polygonal profile or a cross-section of the relatively moving machine part which is shaped by a mixture of different profiles is readily possible, for example a cross-section in which flat surfaces, lightly and strongly curved surfaces are connected to one another.
  • appropriate training can transmit torsional forces over the connection zone of the sealed parts, which is of great advantage for certain applications. A good sealing result with a long service life is guaranteed in any case.
  • the sealing ring In cases where the sealing ring is intended for use in sealing a relatively moving machine part with at least one plane surface extending parallel to the direction of movement, it has proven to be advantageous if the section of the sealing lip sealing the plane surface is inclined continuously in the same direction .
  • the sealed medium stripped from the flat surface is accumulated to a particularly large extent by appropriate training, which makes it much easier to remove foreign bodies from the area of the dynamic sealing zone.
  • the sealing lip as a whole has a relatively large axial extension, which is not always tolerable.
  • the section sealing the plane surface the sealing lip has two adjacent areas of an opposite direction of inclination. These are appropriately inclined so that the sealing lip projects into the sealed space in the zone of mutual connection of the two areas.
  • a ship's bow-like design of the sealing lip in the area of the flat surface has proven to be expedient, the two adjacent areas of the sealing lip advantageously being formed so as to merge into one another, ie with a rounded course of the sealing lip.
  • the sealing ring shown is intended for a fixation in a cylindrical bore and for the dynamic sealing of a rod of square profile which moves axially back and forth in the bore.
  • the sealing ring has a profile of substantially X-shaped shape, which is sealed on the outside by axially projecting, statically acting sealing lips from the cylindrical housing bore, not shown, and on the inside by axially projecting, dynamically acting sealing lips from the rod to be sealed.
  • statically acting sealing lips are characterized over the entire circumference by a constant profile, which is widened only at the location of a projection that acts as an anti-rotation device.
  • the dynamically acting sealing lips are increasingly thickened in the direction of the central part of each sealing surface of the rod to be sealed and bulged inwards.
  • the statically acting sealing lips are accordingly of circular shape, the dynamically acting sealing lips are adapted approximately to the square profile of the rod to be sealed. They are continuously merged into one another, and the inward-facing curvature arranged in the middle region experiences an axial displacement due to the introduction of the rod to be sealed, which leads to an inclined position of the sealing lip with respect to the direction of movement of the rod to be sealed.
  • the inclination with respect to the direction of movement resulting from the inclined position of the sealing lip differs in different zones and has increasingly larger values in the direction of the mutual delimitation of the sealed plane surfaces than in the central region.
  • the medium volume stripped from the sealed rod under operating conditions experiences an intensive circulation leading out of the area of each plane surface, which makes it extremely difficult for foreign bodies to enter the sealing gap in this critical area.
  • the inclination of the sealing lip is varied symmetrically over the width of each sealing surface of the sealed rod.
  • the pressure on the rod to be sealed is based on the inherent elasticity of the elastomeric material used. It is completely balanced by increasing the cross section of the dynamic sealing lips towards the center of each sealed surface. Therefore, changes in the sealing result are not to be expected even after long use.
  • the elastomeric material used is an elastomeric polyurethane with a Shore A hardness of 80-95. The use of rubber is of course also possible.
  • the sealing ring according to the invention enables a significant improvement in the performance properties achieved to date. It is relatively simple and accordingly inexpensive to manufacture and is suitable both for the sealing of liquid and for the sealing of gaseous substances.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Glass Compositions (AREA)
  • Sealing Devices (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Materials For Medical Uses (AREA)
  • Automatic Assembly (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
EP85109911A 1985-03-19 1985-08-07 Dichtring Expired - Lifetime EP0195115B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109911T ATE56797T1 (de) 1985-03-19 1985-08-07 Dichtring.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853509840 DE3509840A1 (de) 1985-03-19 1985-03-19 Dichtring
DE3509840 1985-03-19

Publications (3)

Publication Number Publication Date
EP0195115A2 EP0195115A2 (de) 1986-09-24
EP0195115A3 EP0195115A3 (en) 1987-11-19
EP0195115B1 true EP0195115B1 (de) 1990-09-19

Family

ID=6265659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109911A Expired - Lifetime EP0195115B1 (de) 1985-03-19 1985-08-07 Dichtring

Country Status (5)

Country Link
EP (1) EP0195115B1 (no)
AT (1) ATE56797T1 (no)
DE (2) DE3509840A1 (no)
ES (1) ES288992Y (no)
NO (1) NO171577C (no)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4139919C2 (de) * 1991-12-04 1994-01-20 Freudenberg Carl Fa Dichtung für einen hin- und hergehenden Körper
DE4208373C2 (de) * 1992-03-16 1994-12-08 Freudenberg Carl Fa Dichtung für ein hin- und hergehendes Maschinenteil
DE29811098U1 (de) * 1998-06-20 1998-09-24 Festo AG & Co, 73734 Esslingen Dichtungsring
EP2360089A1 (en) * 2010-02-23 2011-08-24 Single Buoy Moorings Inc. A fluid swivel for allowing fluid transfer across a rotary interface
IT201800008014A1 (it) 2018-08-09 2020-02-09 Truma Geraetetechnik Gmbh & Co Kg Regolatore di pressione di gas
IT201800008012A1 (it) 2018-08-09 2020-02-09 Truma Geraetetechnik Gmbh & Co Kg Dispositivo di sicurezza per un dispositivo di conduzione del gas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE320226B (no) * 1965-06-14 1970-02-02 Dana Corp
DE1953846U (de) * 1966-10-10 1967-01-19 Alois Ferch Schaftabdichtungsvorrichtung.
DE3039534A1 (de) * 1980-10-20 1982-04-29 Fa. Carl Freudenberg, 6940 Weinheim Selbstarretierender dicht-abstreifring
US4475738A (en) * 1982-04-15 1984-10-09 Hilliard Lyons Patent Management Inc. Dynamic seal arrangement with X-shaped seal

Also Published As

Publication number Publication date
DE3509840C2 (no) 1987-05-14
EP0195115A2 (de) 1986-09-24
DE3579809D1 (de) 1990-10-25
NO171577B (no) 1992-12-21
ATE56797T1 (de) 1990-10-15
DE3509840A1 (de) 1986-10-02
ES288992Y (es) 1986-10-16
NO853515L (no) 1986-09-22
NO171577C (no) 1993-03-31
ES288992U (es) 1986-01-16
EP0195115A3 (en) 1987-11-19

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